Taking advantage of the unique property of graphene oxide (GO) nanomaterials in expanding the light response range of TiO2, we modified the surface of water filtration membranes with TiO2-GO to enhance their photocatalytic activities under both UV and sunlight irradiations. A layer-by-layer approach was employed to sequentially deposit TiO2 nanoparticles and GO nanosheets on a polysullone base membrane, with GO partially reduced via ethanol/UV post-treatment. The grafting of TiO2-GO on the membrane surface was confirmed through the analysis of QCM-D measurements and SEM images. We then studied the photocatalytic properties of the surface-modified membranes in both batch and filtration experiments using methylene blue (MB) as a representative organic contaminant. Compared with polysulfone membranes surface-modified with TiO2 and GO, respectively, the TiO2-GO membrane exhibited significantly improved MB photodegradation kinetics under UV (about 60-80% faster) and sunlight (3-4 Limes faster). Besides, the membrane flux increased as a result of the photo-enhanced hydrophilicity and contaminant degradation. Therefore, surface modification by TiO2-GO grafting provides a very promising route to the fabrication of high-performance photocatalytic membranes for sustainable water treatment. (C) 2014 Elsevier B.V. All rights reserved